RU2273000C2 - Device with magnetic circuit for measuring converter (versions) and usage of the device as oscillation detector or exciter - Google Patents

Abstract

FIELD: measurement technology.

SUBSTANCE: device has coil and two armatures fastened to two discharge-measuring tubes of converter which is used for measurement of parameters of fluid medium. Coil is fastened to holder which has support plate mounted in floating state at discharge-measuring tubes by means of two elastic feet. Armatures have that shape (for example, shape of cups) and are lined up relatively one another in such a way that magnetic fields generated by the device, are concentrated inside the device. According to the other version, device has one more coil. Converter can be presented in form of Coriolis detector used for measuring mass discharge. Device is insensitive to external magnetic fields and are capable of endure of long service life at exploitation at high temperature media.

EFFECT: improved precision of measurement.

30 cl, 6 dwg

Description

This invention relates to a device with a magnetic circuit, intended for use in a measuring transducer, in particular in a Coriolis sensor for measuring mass flow.

To determine the mass flow rate of a fluid, in particular a fluid flowing through a pipe, Coriolis mass flowmeters are often used, which are well known to excite Coriolis forces in a fluid, and as a result receive a measurement signal representing the mass flow through an oscillation transducer and the electronic regulation and evaluation unit connected to it.

Such Coriolis mass flowmeters are known and have long been used in industry. For example, in US patent No. 4756198, 4801897, 5048350, 5301557, 5349872, 5394758, 5796011 and 6138517, as well as in document EP-A 803713 described mass Coriolis flow meters, including a measuring transducer, which includes:

dual flow tube designs in communication with the pipe and containing

a first flow tube that oscillates during operation, and

a second flow tube that vibrates during operation,

the first and second flow tubes oscillate in antiphase,

oscillator for mechanical excitation of the flow tubes and

vibration sensors for detecting vibrations of the flow tubes on the inlet side and the outlet side and for generating at least one electrical signal of the sensor, subject to the influence of mass flow,

wherein the pathogen and / or vibration sensors have at least one device with a magnetic circuit for converting electrical energy into mechanical energy and / or vice versa, containing

at least one coil, which at least temporarily crosses the current and at least temporarily penetrates the magnetic field,

a first anchor attached to a first oscillating flow tube of the transmitter,

a second armature attached to the second oscillating flow tube of the transmitter, and

holder for reel.

As is well known in the art, if in bent or rectilinear flow tubes of such measurement transformations the bending vibrations are excited on the so-called useful mode in accordance with the shape of the first eigenoscillation mode, this causes Coriolis forces to appear in the fluid passing through these tubes . In turn, the Coriolis forces lead to the generation of coplanar bending vibrations superimposed on the excited bending vibrations of the useful mode at the so-called Coriolis mode, so that the vibrations detected by the vibration sensors at the inlet and outlet ends have a measurable phase difference, which also depends on the mass flow .

During operation, the excitation of the flow tubes of the measuring transducer is usually performed at the instantaneous resonant frequency of the first mode of natural oscillations, in particular, with the amplitude of the oscillations, which is kept constant. Since this resonant frequency also depends, in particular, on the instantaneous density of the fluid, industrially supplied Coriolis mass flowmeters can also be used to measure the density of moving fluids.

In devices with a magnetic circuit, proposed in US patent No. 5048350, both the armature and the associated coil are attached directly to the design of dual flow tubes, so that during operation, these armature and coil, following the movements of the associated flow tubes, are almost constantly accelerated . The resulting internal forces, which act, in particular, on the coil, can have values in the ranges far exceeding 10G (= weight). Even if the forces of inertia reach 30G, then this is not unusual. In view of these high mechanical stresses, the coils in such devices with magnetic circuits and, in particular, their windings must withstand a high load in order to guarantee a long service life of the exciters, in particular, during a large number of oscillation cycles, with constant accuracy during operation.

In devices with magnetic circuits, proposed, for example, in US patent No. 4756198, 5349872 or 6138517, such mechanical stress on the coils is avoided by enclosing each of the coils in a holder structure that is at rest relative to oscillating flow tubes, for example, mounted on a support a plate, into the body of the measuring device or into a support frame, elastically fastened directly to the flow tubes, at an almost constant distance from the axis of the center of gravity, in this case the vertical axis, of the device with dual flow tubes.

However, it turns out that although the aforementioned mechanical stresses can be completely eliminated in the aforementioned manner, the accuracy of such a magnetic circuit device can experience a significant negative effect of shifts, in particular, caused by temperature, between the holder structure and the design of dual flow tubes that occur, for example, in applications for fluids with temperatures varying over a wide range. In view of the resulting different expansion of the holder structure and the configuration of the twin flow tubes that only neutralize each other to a limited extent, the resting positions of the armature and the coil change relative to each other.

Although in a device with a magnetic circuit in accordance with US Pat. No. 6,138,517, a very large temperature difference, and therefore a very large difference in extensions, may occur between the holder structure and the design of dual flow tubes in devices with magnetic circuits described in US Pat. No. 5,339,872 whose magnetic fields, in particular in the areas of the anchors, are very homogeneous, even small perturbations can lead to significant inaccuracy. As a result, for example, if the device is used as an oscillation sensor, the signals of this sensor may have a very poor signal-to-noise ratio and / or exhibit very strong harmonic distortion. In addition, the magnetic field of a magnetic circuit device proposed in US Pat. No. 5,339,872 can affect a very large area, i.e. can also penetrate adjacent components of the transmitter and, in particular, other such devices with magnetic circuits and / or flow tubes with a fluid flowing through them, thus introducing, for example, interference voltage. Other disadvantages of such a device with a magnetic circuit are discussed in detail, for example, in US patent No. 6138517.

In order to guarantee high accuracy during operation, despite these temperature-related noise-generating effects on the aforementioned devices with magnetic circuits, such mass flow meters require technical solutions whose high complexity has to be made even higher when compensating for temperature-dependent noise.

Therefore, the objective of the invention is to develop a device with a magnetic circuit, in particular a device for use in a measuring transducer for measuring fluid parameters, which withstands a long service life and, in particular, a large number of oscillation cycles, and which, in particular, if the measuring transducer is used to measure the parameters of fluids with high and / or changing temperatures, it constantly has high accuracy during operation. In addition, the device with a magnetic circuit in accordance with the invention should be insensitive to external magnetic fields.

To solve this problem, the invention proposed a device with a magnetic circuit for converting electrical energy into mechanical energy and / or vice versa, which contains:

at least a first coil crossed by current during operation,

a first anchor attached to a first oscillating flow tube of the transmitter,

a second armature attached to the second oscillating flow tube of the transmitter, and

a holder for the first coil attached to the first and second flow tubes,

moreover, both anchors have such a shape and are so aligned with each other that the magnetic fields generated by the device with a magnetic circuit are essentially concentrated inside this device with a magnetic circuit, and

the first coil and at least the first armature interact by means of a first magnetic field.

In a first preferred embodiment of the invention, the magnetic circuit device comprises a second coil traversed by current during operation, the second coil and the second armature interacting via a second magnetic field.

In a second preferred embodiment of the invention, at least the first armature is shaped and so aligned with the first coil that the first magnetic field propagates uniformly at least on the side of the coil and substantially along a line with the central axis of the coil.

In a third preferred embodiment of the invention, each of the two anchors is bowl-shaped.

In a fourth preferred embodiment of the invention, the first coil is wound on the first core, and this first coil and the first armature are so shaped and so aligned with each other that the magnetic flux passes through the air gap formed between them.

In a fifth preferred embodiment of the invention, each of the two cores is made cup-shaped.

In a sixth preferred embodiment of the invention, the holder is a support plate for supporting at least the first coil, the support plate being mounted in a floating state by means of an elastic first leg attached to the first flow tube and an elastic second leg attached to the second flow tube , on the design of dual flow tubes formed by said two flow tubes.

In a seventh preferred embodiment of the invention, a support plate extending along the structure of the dual flow tubes is attached to the first and second flow tubes at their inlet and outlet ends.

In an eighth preferred embodiment, the transmitter is a Coriolis sensor for measuring mass flow.

In a ninth preferred embodiment of the invention, the magnetic circuit device serves as a vibration exciter intended to mechanically excite the flow tube.

In a tenth preferred embodiment of the invention, the magnetic circuit device serves as an oscillation sensor for detecting vibrations of the flow tubes.

The fundamental idea of the invention is, on the one hand, to develop at least one of the devices with magnetic circuits commonly used in such transducers and, in particular, in Coriolis sensors for measuring mass flow or in Coriolis sensors for measuring mass flow rate and / or density, i.e. an oscillation pathogen and / or an oscillation sensor, so that during operation their coils remain at rest, at least with respect to the axis of the center of gravity of the dual flow tube structure, in particular with respect to the vertical axis of the latter. On the other hand, the aim of the invention is to develop a device with a magnetic circuit, which is basically insensitive to the effects of temperature and whose magnetic field can be prevented from affecting other components, while the device itself is effectively protected from other magnetic fields.

The invention and its additional advantages will become more apparent upon reading the following description of specific embodiments thereof, given with reference to the accompanying drawings. The same positions in all the different drawings are used to denote the same parts, and the already assigned positions are not repeated in subsequent drawings, if this contributes to the clarity of presentation. In the drawings:

figure 1 presents a perspective image of a first embodiment of a device with a magnetic circuit, in particular, suitable for measuring transducers of the Coriolis type;

figure 2 presents a front view in partial section of a device with a magnetic circuit shown in figure 1;

figure 3 presents a front view in partial section of a second embodiment of a device with a magnetic circuit, in particular, suitable for measuring transducers of the Coriolis type;

figure 4 presents a perspective image of the device with the magnetic circuit shown in figure 1, used in a measuring transducer with the design of dual flow tubes;

5 and 6 are perspective views of further embodiments of a magnetic circuit device according to the invention used in a transmitter.

Figure 1-3 shows specific embodiments of a device with a magnetic circuit designed to convert electrical energy into mechanical energy and / or carried out according to the law of electromagnetic induction of the conversion of mechanical energy into electrical energy. This magnetic circuit device is particularly suitable for use in a Coriolis sensor for measuring mass flow or in a Coriolis sensor for measuring mass flow and / or density. A corresponding specific embodiment of a transmitter that responds to the mass flow rate m of fluid flowing through a pipe (not shown) is shown in FIG. 4. As is well known, such a sensor for measuring mass flow, if used as a measuring transducer of a physical parameter to an electrical signal in a Coriolis mass flowmeter, serves to create and detect Coriolis forces in the fluid passing through this sensor, and to convert these forces into useful input signals for subsequent processing by the electronic evaluation unit.

To pass the fluid, the parameters of which are to be measured, the measuring transducer comprises a design 21 of dual flow tubes with a first flow tube 211 and a second flow tube 212, which is preferably identical in shape to the flow tube 212. As is usual with such transducers, flow tubes 211, 212 may have a single bend, i.e. may be U-shaped or may be loop-shaped; however, if necessary, they can also be straightforward.

As shown in FIG. 4, the flow tubes 211, 212 are preferably aligned with each other so that the imaginary median plane between the two tubes, which are preferably parallel to each other, corresponds to the first symmetry plane of the dual flow tube structure 21. In addition, the design of the 21 dual flow tubes is predominantly shaped so that it has a second plane of symmetry that intersects the median plane E ₁ , which also contains the aforementioned vertical axis, in particular at right angles.

Each of the two flow tubes 211, 212 terminates in the inlet pipe 213 and the outlet pipe 214. If the measuring device is installed in the pipe through which the fluid is passed, then the inlet pipe 213 and the discharge pipe 214 are respectively connected to the straight sections of the pipe on the inlet side and the outlet side and therefore preferably aligned with each other and with the longitudinal axis A _{1 of the} structure 21 of the dual flow tubes that connects them, as is usually the case with such transducers. If the measuring transducer is to be detachable from said pipe, then a first flange 215 and a second flange 216 are provided on the inlet pipe 213 and the outlet pipe 214, respectively; however, if necessary, the inlet pipe 213 and the outlet pipe 214 can also be connected directly to the pipe, for example by welding or brazing.

When used in flow tubes 211, 212, as mentioned above, they bend vibrations in the useful mode, in particular at the natural resonance frequency of the eigenmode, so that these tubes oscillate in antiphase, which is common in such transducers. As is well known, the Coriolis forces excited in this way in a fluid passing through the flow tubes 211, 212 cause additional elastic deformation of these tubes, which is also called the Coriolis mode and which is superimposed on the excited vibrations on the useful mode and also depends on the mass flow rate m, to be measured.

If necessary, any mechanical stresses caused by the oscillating flow tubes 211, 212 in the inlet pipe 213 and the outlet pipe 214 can be minimized, for example, by mechanically connecting the pipes by means of at least one nodal plate 217 at the inlet end and at least one node plate 218 at the outlet end, which is common for such transducers.

For mechanical excitation of the flow tubes 211, 212, the measuring transducer comprises at least one oscillator 22. The latter serves to convert the excitation electric energy E _exc supplied from the electronic control unit, for example, located in the aforementioned mass flow meter, to the excitation forces F _exc , for example, pulsating or harmonic excitation forces that act on the flow tubes 211, 212 symmetrically, i.e. e. simultaneously and equally, but in opposite directions, thus causing oscillations in the antiphase of the flow tubes 211, 212. The excitation forces F _exc can be controlled in amplitude, for example, by means of a phase locked loop (PLL), in accordance with a method known to those skilled in the art in the art, see also US Pat. No. 4,801,897.

To detect vibrations of the flow tubes 211 and 212, the measuring transducer comprises a first oscillation sensor 23 on the inlet side and a second oscillation sensor 24 on the outlet side, which respond to the movement of the tubes, in particular to their lateral deviations, and respectively generate the corresponding first and second signals S ₂₃ and S ₂₄ oscillations.

In the measuring transducers of this type, the device with a magnetic circuit corresponding to the invention, if used as a pathogen 22, can serve to create excitation forces F _exc , causing mechanical excitation of the flow tubes 211, 212. In addition, the device with a magnetic circuit, as mentioned above , can be used as a vibration sensor 23 or 24 to measure the movements of the flow tubes 211, 212 and to generate a vibration signal S ₂₃ or S ₂₄ , respectively.

For the mutual conversion of mechanical and electrical energy, the device with a magnetic circuit contains at least a first, preferably cylindrical, coil 13, which is crossed by current during operation and which is attached to the structure 21 of the dual flow tubes through the holder 15. In a preferred embodiment, the holder 15 is attached a second coil 14, in particular a coil aligned with the coil 13.

In addition, the device with a magnetic circuit contains a first armature 11, which is attached to the flow tube 211 and which during operation interacts with the conductive coil 13 by means of a magnetic field B ₁ , and a second armature 12, in particular, an armature that is identical to the armature 11 in shape, attached to the flow tube 212 and can interact with the conductive coil 14 through a magnetic field B ₂ . The magnetic field B ₁ can be, for example, an alternating field that is generated by a coil 13 and on which a static field generated by an armature 11 can be modulated; likewise, a magnetic field B ₂ can be generated, for example, by means of a coil 14 and an armature 12.

Both anchors 11, 12 also serve to give uniformity to the magnetic fields generated by the device with the magnetic circuit, in particular the magnetic field B ₁ and magnetic field B ₂ , also outside the coil 13, and to concentrate these fields within the narrowest possible space, which is essentially inside the magnetic circuit device itself. The anchors 11, 12 also serve to form and direct the aforementioned magnetic fields so that their magnetic induction is as large as possible, in particular so that they have constant magnetic induction even in air. Therefore, the anchors 11 and 12 are preferably made at least partially from a ferromagnetic material, which, as is well known, has a very high magnetic permeability, and therefore concentrates the magnetic fields.

In a preferred embodiment, the armature 11 also serves to generate a constant static component of the magnetic field B ₁ ; similarly, the constant static component of the magnetic field B _{2 is} generated by the armature 12. In particular, in this case, the armatures 11 and 12 are made at least partially of a magnetically hard, for example, pre-magnetized material such as AlNiCo, NyFeB, SmCo or another alloy rare earth elements. As the material of the anchors 11, 12, in this particular embodiment, it is also possible to use a less expensive automatic steel or structural steel.

As shown in FIGS. 1-3, the anchor 11 is rigidly attached to the flow tube 211 by means of a flexible flexible first corner 11A, and the anchor 12 is rigidly attached to the flow tube 212 by means of a flexible flexible second corner 12A. The corners 11A and 12A can be connected respectively to the flow tubes 211 and 212, for example, by welding or brazing.

As shown, for example, in FIG. 1, the coil 13, as well as the coil 14, if any, is attached by means of the holder 15 to both flow tubes 211, 212 so that the axis of symmetry of the device with the magnetic circuit is actually parallel to the median plane E ₁ 21 twin flow tube designs. In a preferred embodiment, the holder 15 is attached to the flow tube 211 by the first leg 15A and to the flow tube 212 by the second leg 15B. In addition, both, preferably elastic, legs 15A, 15B are mutually connected, preferably rigidly, at respective ends remote from the dual flow tube structure 21 by means of a support plate 15C. The holder 15 can be made either in the form of a single part, for example by frame stamping, or it can be a multi-element design. It can be made, for example, of the same materials that are used for flow tubes 211, 212.

If the flow tubes oscillate in antiphase, as described above, the holder 15 will be deformed, in particular, due to lateral deflection of the legs 15A, 15B fastened to the flow tubes 211, 212, and its axis of symmetry will essentially remain in its position relative to the median plane of E ₁ . So, the coil 13, supported by the support plate 15C, for example, by means of the comb portion 15D provided on the latter, is mounted in a floating state on the structure 21 of the dual flow tubes and is held at a substantially constant distance from the median plane E ₁ .

To prevent the influence of the holder 15 on the shape of the mode of oscillation of the oscillating flow tubes 211, 212, this holder is made pliable. To achieve this, the legs 15A, 15B, which also oscillate during operation, can be made from a suitable thin strip of sheet metal.

In yet another specific embodiment, the support plate 15C, as conventionally shown in FIGS. 5 or 6, is shaped and attached to the flow tubes 211, 212 such that the plate extends substantially parallel to the flow tubes and substantially along the entire length 21 twin flow tube designs. In this case, the support plate 15C is advantageously attached directly to the node plate 217 at the inlet end and to the node plate 218 at the outlet end. The inventors unexpectedly found that if, for example, the expansion of the flow tubes 211, 212 caused by the temperature is parallel to the median plane E ₁ , then the holder 15 attached in this way can track these extensions to the point at which any relative shift between the holder 15 and the design of 21 dual flow tubes is negligible.

A particular advantage of this particular embodiment of the invention is that it eliminates the need to further secure the holder 15 to the structure 21 of the dual flow tubes by legs 15A, 15B — see, for example, FIG. 6.

According to a first embodiment of the invention, the magnetic circuit device is an electrodynamic type device, i.e. a device in which an electric conductor forming a closed loop, for example a coil 13, is pierced, in particular perpendicularly, by a magnetic field generated by at least one permanent magnet, and in which the closed loop and the permanent magnet are moved relative to each other. For this purpose, the coil 13 is preferably attached to the structure 21 of the dual flow tubes by means of the holder 15 so that the central axis A _{13 of the} coil is essentially perpendicular to the median plane E ₁ .

In order to give uniformity to the magnetic fields B ₁ , B ₂ and to fix as much magnetic induction as possible, in particular, external anchors 11, 12 in a preferred embodiment of the first embodiment of the invention, each of both anchors 11, 12, as conventionally shown in FIG. 1 and 2 has a cup shape, the bottom of which has a rod made thereon, preferably magnetically rigid, which is coaxial with the wall of the cup.

In yet another preferred embodiment of the invention, the anchors 11 and 12 - as usual in such devices with magnetic circuits - are preferably made at least partially, i.e. in the region of the aforementioned wall of the bowl, made of soft magnetic material such as ferrite or cow (Corovac).

According to a second embodiment of the invention, the magnetic circuit device is an electromagnetic type device, i.e. a device in which two ferromagnetic bodies arranged to move relative to each other are arranged relative to each other so that at least one adjustable air gap between them is pierced by a magnetic field, preferably uniform, with a large magnetic induction, see in particular, EP-A 803713.

In this second embodiment of the invention, the magnetic circuit device further comprises a ferromagnetic first core 13A for the coil 13, this core being attached to the holder 15. As shown in FIG. 3, the core 13A passing through at least a portion of the coil 13 is opposite anchors 11 and is separated from it. In this second embodiment of the invention, the core 13A and the armature 11 serve to form an adjustable first air gap through which the magnetic field B ₁ passes at least partially. The magnetic circuit device preferably also comprises a ferromagnetic second core 14A for the coil 14, this second core being attached to the holder 15 at some distance from the armature 12. Thus, the core 14A and the armature 12 form an adjustable air gap, in particular an air gap pierced by magnetic field B ₂ .

To generate constant static components of magnetic fields and weaken eddy currents in a device with a magnetic circuit, each of the cores 13A and 14A is preferably made, at least in part, of a magnetically hard, but poorly conductive material, such as one of the aforementioned rare earth alloys - AlNiCo , NyFeB, SmCo, etc.

In order to fix the magnetic resistance for the magnetic field B ₁ , which is as small as possible even outside the core 13A, in a preferred embodiment of the second embodiment, the core 13A is made as a single ferromagnetic first yoke 13B extending outside the coil 13, as shown in FIG. 3 ; likewise, core 14A may have a ferromagnetic second yoke 14B provided thereon for magnetic field B ₂ , preferably identical in shape to yoke 13B. As is usual in such devices with magnetic circuits, yokes 13B, 14B can advantageously be made of soft magnetic materials such as ferrite or cow.

In a further preferred embodiment of the invention, the core 13A and the yoke 13B are shaped and aligned with each other so that the free ends of the core 13A and the yoke 13B that are in contact with the air gap are substantially planar and coplanar. Then the free end face of the armature 11, which is in contact with the air gap, will preferably also be flat. In this case, this end can also be parallel, for example, to the opposite free ends of the core 13A and yoke 13B. If necessary, the armature 11, the core 13A and the yoke 13B can be performed on the basis of the principle of the coil and rod.

In a further preferred embodiment of the second embodiment of the invention, the yoke 13B is in the form of a casing of a coil, in particular a casing, coaxial with a coil 13, see, for example, EP-A 803713.

Additional details and specific embodiments regarding the operation of the magnetic circuit device in accordance with the second embodiment of the invention, or regarding the shape and arrangement of the coil 13 and yoke 13B, as well as the coil 14 and yoke 14B, if any, are described, for example, in EP- A 803713, the rights to which the Applicant owns this application and which is mentioned in this description for reference.

Claims (29)

1. A device with a magnetic circuit containing a first coil through which current flows during operation, a first armature attached to a first oscillating flowmeter tube of the transmitter, a second armature attached to a second oscillating flowmeter tube of the transmitter, and a holder for the first coil attached to the first and second flow tubes, wherein the two anchors are so shaped and so aligned with each other that the magnetic fields generated by The magnetic loop properties are essentially concentrated within the magnetic loop inside this device, and the first coil and the first armature interact through the first magnetic field, the holder for the first coil containing a support plate that is mounted in a floating state on the structure of the dual flow tubes using a first elastic leg attached to the first flow tube, and using a second elastic leg attached to the second flow tube, wherein the first and second flow meter The second tubes form a twin flow tube structure having an imaginary middle plane located between the first and second flow tubes, the middle plane corresponding to the symmetry plane of the dual flow tubes structure, and the first coil attached to the holder so that the central axis of the first coil is essentially perpendicular to the imaginary middle planes of dual flow tubes. 2. The device according to claim 1, which contains a second coil through which current flows during operation, the second coil and the second armature interacting through a second magnetic field. 3. The device according to claim 1, in which at least the first armature is so shaped and so aligned with the first coil that the first magnetic field propagates uniformly, at least on the side of the coil and essentially along the same line with the central axis of the coil. 4. The device according to claim 1, in which each of the two anchors is made bowl-shaped. 5. The device according to claim 1, in which the first coil is wound on the first core, and in which the first coil and the first armature are so shaped and so aligned with each other that the magnetic flux passes through the air gap formed between them. 6. The device according to claim 5, in which each of the two cores is made bowl-shaped. 7. The device according to claim 1, in which the support plate passing along the design of the dual flow tubes is attached to the first and second flow tubes at their inlet and outlet ends. 8. The device according to one of claims 1 to 7, in which the measuring transducer is a Coriolis sensor for measuring mass flow. 9. The use of the device according to one of claims 1 to 7 as a vibration exciter intended for mechanical excitation of flow tubes. 10. The use of the device according to one of claims 1 to 7 as an oscillation sensor designed to detect vibrations of flow tubes. 11. A device with a magnetic circuit, configured to be used with a first oscillating flowmeter tube and a second oscillating flowmeter tube, the device comprising a first armature attached to a first oscillating flow tube of the measuring transducer; a second armature attached to the second oscillating flow tube of the transmitter; the first coil through which current flows during operation, while the first coil and the first armature interact with each other through the first magnetic field; a second coil interacting with the second armature through a second magnetic field, and a holder for the first and second coils attached to the first and second flow tubes, wherein the first and second coils are attached to the holder so that the second coil is aligned with the first coil. 12. The device according to claim 11, in which the first and second anchor are made bowl-shaped. 13. The device according to claim 11, in which the first flow tube and the second flow tube form the design of dual flow tubes; the holder comprises a support plate for supporting the first and second coils; the support plate is mounted in a floating state on the design of the dual flow tubes using the first elastic legs attached to the first flow tube, and using the second elastic legs attached to the second flow tube, and the first and second legs are installed with the possibility of oscillation during operation. 14. The device according to item 13, in which the support plate passing along the design of the dual flow tubes is attached to the first and second flow tubes at their inlet and outlet ends. 15. The device according to claim 11, in which the measuring transducer is a Coriolis sensor for measuring mass flow. 16. The device according to claim 11, in which the first and second flow tubes form a dual flow tube structure having an imaginary middle plane located between the first and second flow tubes; the middle plane corresponds to the plane of symmetry of the dual flow tube structure and the first coil is attached to the holder so that the central axis of the first coil is substantially perpendicular to the imaginary middle plane of the dual flow tubes. 17. The device according to item 12, in which each cup-shaped first and second anchor has a rod formed at the bottom of the bowl of the corresponding anchor. 18. The use of a device with a magnetic circuit according to claim 11 as an exciter of oscillations for exciting flow tubes. 19. The use of a device with a magnetic circuit according to claim 11 as an oscillation sensor for measuring vibrations of flow tubes. 20. A device with a magnetic circuit containing a first anchor attached to the first oscillating flow tube of the measuring transducer; a second armature attached to the second oscillating flow tube of the transmitter; the first coil through which current flows during operation, while the first coil and the first armature interact with each other through the first magnetic field; a holder for the first coil attached to the first and second flow tubes, in which each first and second armature is bowl-shaped, wherein the first and second flow tubes form a dual flow tube structure having an imaginary middle plane located between the first and second flow tubes the plane corresponds to the plane of symmetry of the design of the dual flow tubes, and the first coil is attached to the holder so that the central axis of the first coil is along a medium perpendicular to the imaginary middle plane of dual flow tubes. 21. The device according to claim 20, in which each cup-shaped first and second anchor has a rod formed at the bottom of the bowl of the corresponding anchor. 22. The device according to claim 20, in which the holder contains a support plate for supporting the first coil; the support plate is mounted in a floating state on the design of the dual flow tubes using the first elastic legs attached to the first flow tube, and using the second elastic legs attached to the second flow tube, while the first and second legs are installed with the ability to oscillate during operation. 23. The device according to claim 20, which contains a second coil through which current flows during operation, while the second coil and the second armature interact with each other through a second magnetic field in which the second coil is aligned with the first coil. 24. A device with a magnetic circuit containing a first anchor attached to the first oscillating flow tube of the measuring transducer; a second armature attached to the second oscillating flow tube of the transmitter; the first coil through which current flows during operation, while the first coil and the first armature interact with each other through the first magnetic field; a holder for the first coil attached to the first and second flow tubes, in which the first and second flow tubes form a dual flow tube structure having an imaginary middle plane located between the first and second flow tubes; the middle plane corresponds to the symmetry plane of the construction of the dual flow tubes, and in which the first coil is attached to the holder so that the central axis of the first coil is essentially perpendicular to the imaginary middle plane of the dual flow tubes. 25. The device according to paragraph 24, in which the holder contains a support plate for supporting at least the first coil; the support plate is mounted in a floating state on the design of the dual flow tubes using the first elastic legs attached to the first flow tube, and using the second elastic legs attached to the second flow tube, while the first and second legs are installed with the ability to oscillate during operation. 26. The device according to paragraph 24, which contains a second coil through which current flows during operation, while the second coil and the second armature interact with each other through a second magnetic field in which the second coil is aligned with the first coil. 27. A device with a magnetic circuit containing a first armature and a second armature, wherein the first armature is attached to the first oscillating flowmeter tube of the transmitter, and the second armature is attached to the second oscillating flowmeter tube of the transmitter; the first coil and the second coil, while during operation, current flows through each of the coils, while the first coil and the first armature interact with each other through the first magnetic field; the second coil and the second armature interact with each other through a second magnetic field, and a holder for the first coil and the second coil, with the holder attached to the first and second flow tubes. 28. The device according to item 27, in which the measuring transducer is a Coriolis sensor for measuring mass flow. 29. The device according to item 27, in which the holder contains a support plate for supporting the first and second coils; the support plate is mounted in a floating state on the design of the dual flow tubes using the first elastic legs attached to the first flow tube, and using the second elastic legs attached to the second flow tube, while the first and second legs are installed with the ability to oscillate during operation.

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